This function allows paste columns
.pasteCols(mat, sep = "")
simplified/non-redundant vector/matrix (ie fewer lines for matrix), or respective index
inital matrix
(character) separator
unique
, nonAmbiguousNum
, faster than firstOfRepeated
which gives more detail in output (lines/elements/indexes of omitted)
.pasteCols(matrix(11:16,ncol=2), sep="_")
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